If you thought you were a Harry Potter fan, think again.

On Wednesday night, The Roots performed an impromptu "Harry Potter" rap based on a "Tonight Show" fan’s suggestion.

It all started when Jimmy Fallon read the viewer’s genius idea: "Hey Jimmy, I love the Harry Potter theme, but I also love rap. Is there anyway you can combine the two?"

Tarik, an avid "Harry Potter" fan, then began to spout lyrics about J.K. Rowling’s magical realm, incorporating butter beer, Hogwarts, Voldemort and Diagon Alley!

Check out the video above!

Click "Launch Gallery" below to see your the cast the kids of "Harry Potter," now and then.


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